function randomDate() { 

    //echo date( "Y-m-d H:m:s", $newtime);

    //echo date("Y-m-d H:m:s", strtotime("+2 week 1 days 7 hours 5 seconds"));

    $begin = strtotime("now");

    $end = strtotime("+1 Month");

    $timestamp = rand($begin, $end);

    return date("Y-m-d H:i:s", $timestamp);

}

echo randomDate();